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Re: Hardness, Calcium, Magnesium
John Fitch wrote:
> I believe these numbers are all in terms of CaCO3. Am I correct in then
> multiplying the Calcium reading by 40/100 or 0.4 to obtain the Ca++
> concentration and the Magnesium reading by 24/100 or 0.24 to obtain the Mg++
> This would mean:
> Ca++ = 32 mg/l
> Mg++ = 14 mg/l
Looks fine to me.
> Secondly, I have found rather wide ranges of recommended levels for these
> two nutrients in the archives, but there seems to be some agreement on a
> ratio of Ca to Mg of 2:1 or 3:1, with a Ca range of 15-75 mg/l and an Mg
> range of 5-25 mg/l. Are these ratios and ranges still the recommended
> values? If not, what should I be aiming at?
I think they're fine. I wouldn't worry too much abut the Ca:Mg ratio.
You just don't want to go to extremes, like 10:1 or 1:10. In nature Ca
normally exceeds Mg, but the actual ratio is quite variable.
> Thanks in advance for your corrections and advice.
Umm. Buy low, sell high.